Question

I have a requirement to write a regex to validate a text entry. The text must be between 5 and 16 characters (a-Z plus hyphen, underscore and space). This is fine but it must also check that there are not any consecutive spaces.

e.g.

hello        // PASS
hello there  // PASS
hi there you // PASS
hello  there // FAIL - two spaces between hello and there

Answer 1

You can use something like:

/^(?!.*  )[-a-z_ ]{5,16}\z/i